Tint, I would say it is characterless, this is a good thing. I can't describe it as yellow, greenish, rosy or vanllia'sh. It is perfectly neutral to my eyes, and produces colors a lot more faithfully.
Beam profile, the spot in the middle is a on the "tight" side of things but it also has good spill. This is what I call a true "spot/spill"
Battery life, I gotta be honest, and say I am just a little disappointed here. My tests show about 15-20% less than advertised (to 50% brightness with duraloops).
User interface, I have read a lot of pleased reviews about the UI, after using the light for about a week. I can say I totally agree, it has one of the best UI's for a light I have used.
Build quality, the H51c feels very tough for such a small light, the finish is excellent. Actually the best I have now.
Output, I notice a trend these days, new flashlight hobbyists will go after the brightest (lumens) and the tightest concentrated spot. More experience users tend to for the opposite, like a real moon light mode and good spill (not all but most). As for the H51c, it has both and the UI lets you to get to both from the off position.
Head strap, the H51c is a headlamp anyways, it is comfortable. But I feel like it has to be on tightly for it not to bounce when walking, let alone jogging.
Other notes: I love the easily reversible pocket clip! I am finding that I am just clipping on my shirt or belt more often than a headlamp.
Some quick and dirty beamshots.
Quark 1AA Warm white (left) H51C (right)
TK20 (left) H51c (right)
More photos will be posted when I feel inspired.
Has anyone ever tested Zebralights actual OTF claims?
FWIW, other lights I own:
Quark 1 x AA tactical
Quark 1 x AA tactical Warm white
Streamlight ProPolymer 4AA Lux
Energizer Lithium 1 AA
Energizer 1xAA headlamp
Streamlight 1 luxeon 3 x AAA
and many more.
Note to Admin, there is something wrong when I have to log back in. After I log in and redirects me to a blank page without actually posting my message. If I go back, the message box is blank and I have to rewrite everything.